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Drawing a triangle

Cecille Yang

Joined: Sep 17, 2011
Posts: 2
I'm really new to programming in general, and for my comp sci class we have to create a rectangle. The teacher wants two classes- one that creates the lines (using Line2D.Double) and extends JComponent, and the JComponent, which is the viewer class. I only drew one line in the Triangle class because I wanted to get the program up and running before fiddling around with the more specific details.

My problem is that the frame.add in the viewer class isn't working... there's an error "The method add(Component) in the type Container is not applicable for the arguments (Triangle)".

Code for Triangle:

Code for my viewer:
Ulf Dittmer

Joined: Mar 22, 2005
Posts: 42958
JComponent is the name of an existing class (javax.swing.JComponent) - you shouldn't use that as the name of one of your classes. Or -if you need to do that for the purposes of your assignment- you need to declare Triangle as "... extends javax.swing.JComponent".
Cecille Yang

Joined: Sep 17, 2011
Posts: 2
Oh, that would do it. Thanks!
Rob Spoor

Joined: Oct 27, 2005
Posts: 20078

Your paintComponent method is missing the call to super.paintComponent(g).

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